Suppose that in Year 1 daily sales at Dave's Deli daily totaled $1,000, and daily sales at Bertha's Burgers totaled $1,500. In Year 2, Dave's daily sales increased to $1,300, and Bertha's daily sales increased to $1,800. The percentage change in sales for Dave was

30%

Explanation:

Given that,

In year 1:

Dave's Deli sales = $1,000

Bertha's Burgers sales = $1,500

In year 2:

Dave's Deli sales = $1,300

Bertha's Burgers sales = $1,800

Therefore,

percentage change in sales for Dave:

= [ (Change in sales) : sales in year 1] * 100

= [ ($1,300 - $1,000) : $1,000] * 100

= ($300 : $1,000) * 100

= 0.3 * 100

= 30%

Therefore, the Dave's sales increases by 30%.